參數(shù)資料
型號: QLU2108-PQ208C
英文描述: Telecommunication IC
中文描述: 通信集成電路
文件頁數(shù): 15/22頁
文件大?。?/td> 195K
代理商: QLU2108-PQ208C
QLUX2108-PQ208C Device Data Sheet
15
QLUX2108-PQ208C Device Data Sheet
7.4 Utopia Interface MPHY Receive (L2)
When operating in MPHY mode, the Master checks, (Typically in a round robin fashion)
the status of all the Slave ports. Two options are defined by the Utopia standard:
Polled status indication with all the PHY ports using a signal CLAV signal to report their
status to the Master
Direct status indication with one CLAV implemented per PHY port or per Utopia group.
In MPHY mode only one receive PHY port is selected at a time for data transfers but the
Master can continuously polls the status of the Slave PHY ports.
7.4.1 MPHY Operation with Direct Status
For each PHY port, a status signal
ut_rxclav_dir(n)
is permanently available. For
each port independently,
ut_rxclav_dir(n)
is asserted when the corresponding PHY
port has a cell available in its FIFO 1 and
ut_rxclav_dir(n)
is de-asserted when the
corresponding port FIFO cannot transmit a complete cell to the Master
2
.
Status signals and cell transfers are independent of each other for each port. No address
information is needed to obtain status information. Address information must be valid only
for selecting a PHY port prior to one or multiple cell transfers. To select a port, the Master
de-asserts
ut_rxenb
3
, puts address port on
ut_rxaddr(4:0)
4
, the port is selected
by the Slave when
ut_rxenb
goes low (Re-asserted by the Master)
5
.
Figure 12: MPHY Receive - Direct Status Indication
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